Why are manhole covers round? - Marc Chamberland Why are manhole covers round? - Marc Chamberland begin-post-stats TED-Ed • 430K views end-post-stats begin-duration 3:35 end-duration Math topics: _Curves_##Curves##_Circle_##Circle##_Reuleaux_triangle_##Reuleaux triangle##_Curve_of_constant_width_##Curve of constant width##_Elementary_geometry_##Elementary geometry##_Pi_##Pi##_Perimeter_##Perimeter##_Diameter_##Diameter Other topics: _Affine_geometry_##Affine geometry##_Edge_(geometry)_##Edge (geometry)##_Parallel_(geometry)_##Parallel (geometry)##_Vertex_(geometry)_##Vertex (geometry) video-id: wDBb2_I-oC4 channel_TED-Ed_ So What Learning Affine geometry , Curves , Elementary geometry Sunday, January 21, 2018 Share Share
